引言随着化肥施用量迅速增加,化肥品种也在逐步更新,黑龙江的一些国营农场,尿素施用几乎全取代了硝铵、硫铵等氮肥。由于对尿素性质还了解不清,经常出现大面积烧种现象,给生产带来严重损失。据黑龙江国营农场1976年不完全统计,因尿素烧种 Introduction With the rapid increase in the amount of chemical fertilizers, chemical fertilizer varieties are also gradually updated, some state-owned farms in Heilongjiang, urea almost completely replaced the use of ammonium nitrate, ammonium sulfate and other nitrogenous fertilizers. As the nature of urea is also unclear, often large-scale burning phenomenon, to produce a serious loss. According to Heilongjiang state-owned farms in 1976 incomplete statistics, because of urea burning seed